Within Profit Rhino, you can easily hide sections of your price book from the view of your technicians by deactivating them. The toggle on the lower right hand side of the category box allows you to effectively 'turn off' a business type, category or subcategory.
You don't lose the data forever when you deactivate. You can easily reactivate by flipping that same toggle the other way.
This functionality applies to not only the Profit Rhino mobile app, but to all of the Field Service Software's that we export out to/integrate with.
Attached below is a screen shot and video that can help you understand where to find the inactivate Toggle. The area to inactivate is highlighted with the red box below.